Multi-gas cooker, with a rotary valve provided with interchangeable regulating means

ABSTRACT

The cooking appliance ( 1 ) having a control panel ( 2 ) is equipped with one or more gas flow (Q) regulating valves, wherein the rotary regulating plug ( 6 ) is provided with various peripheral through holes ( 16 - 19 ). The control knob ( 9 ) being interchangeable for fitting to the actuating shaft ( 7 ), is chosen from the two units available, one and the other permitting different angular limit positions of the regulating plug ( 6 ) for the supply of a constant minimum gas flow Qmin, adjusted each one for a different type of gas N gas or LP gas. The outlet conduit ( 5 ) of the valve is equipped with a further injector nozzle ( 21,23 ) for adjusting a constant gas flow Qmax to be fed into the conduit ( 25 ) of the correspondent burner, when the cooking appliance is supplied with a LP gas.

TECHNICAL FIELD

The present invention relates to a gas valve of the conical rotary plug type attached to an actuating shaft, being the gas valve mounted on the panel of a cooking appliance and its outlet conduit faced to a burner inlet, wherein the rotary plug is provided with a control knob, and aperture means for adjusting the flow rate according to the fuel gas family supplied to the cooking appliance, and the outlet conduit with an injection means.

PRIOR ART

Gas valves of the above-defined type are already known, wherein he gas valve is mounted on the front control panel with the actuating shaft passing through a external control panel in the appliance, and the valve body resting inside the appliance faced to the fuel inlet of a burner. The external free end of the actuating shaft is fitted with a rotary control knob inserted in the latter. The control knob is removable from the shaft by pulling it out. The hollow body of the valve has its own gas outlet conduit which is connected to the respective appliance burner. The outlet conduit is provided with an injector nozzle having a calibrated discharge orifice in correspondence with the gas family supplied to the appliance, LP gas or N gas. In the spacing apart between the discharge nozzle of the valve and the burner inlet, is taken the primary air to feed the fuel mixture into the burner.

An example of rotary valve of the above type is disclosed in U.S. Pat. No. 6,520,481-B2, having its actuating shaft coupled to a frusto-conical regulating plug or valve plug, which is able to rotate a given angle for the supply of a gas flow from two angular positions spaced around 120° apart, corresponding respectively to a high or maximum flow “Qmax” and to a low or minimum flow “Qmin”, the latter applied to “gentle boiling”. The rotation of the shaft as far as one of the angular positions, is started from an initial valve closed “OFF” position.

In this type of known valves the actuating shaft has a pin protruding in a radial direction to limit its angular travel, guided on a circular surface in the inner face of the body cover or valve cap, or in some other part of the valve body. The total travel of the regulating plug thus limited is, for instance, 270 degrees from the OFF position. The end position corresponds to Qmin. Any of the flows Qmax, Qint (intermediate flow) and Qmin is regulated by way of a corresponding hole or groove in the regulating plug facing the outlet conduit. All the flow rate are supplied from a common inlet conduit through an inner chamber in the regulating plug which is in communication with an outlet conduit. The Qmin outlet hole or groove shaped opening has an area of calibrated section for a standard type of given fuel gas, adjusted according to the output power of the cooking appliance burner.

Solutions are already known for a single valve to be mounted on cooking appliances that use two different types of gas, such as natural gas (NG) or liquefied petroleum gas (LPG). For example in U.S. Pat. No. 5,009,393, an additional valve element in the form of a sleeve is inserted in the inner chamber of the valve regulating plug. The area of the opening section for the passage of gas flow towards the outlet, that which corresponds to low flow or minimum flow Qmin, is adjusted by rotating this added valve sleeve which thus modifies the uncovered section area of the outlet opening. This known solution has the disadvantage that for adjusting the Qmin for the rotation of the valve sleeve, it is necessary to use a screwdriver, which has to be inserted from an opening in the actuating shaft until it reaches the valve sleeve and to transmit a precise turn.

A known regulating gas valve, for example the disclosed in U.S. Pat. No. 4,947,891-A, comprises a rotary valve plug coupled to a passage disc provided aperture means for regulating the gas flow supplied to the burner, and an injector nozzle threaded to the outlet conduit. The passage disc is held stationary in the valve housing, and provides an arc groove restricting the passage area for the flow, for use with both LP gas and N gas, while the injection orifice of the nozzle is limiting the large changes of gas flow.

DISCLOSURE OF THE INVENTION

The object of the invention is a gas domestic cooking appliance, provideed with at least a rotary valve of the type with a frusto-conical regulating plug coupled to an actuating shaft and to a control knob, being capable of supplying the different required flows of gas lying at a plurality of angular positions, of either of the two different types of gas, N gas or LP gas, the valve having a control knob being interchangeable on the actuating shaft, with a means for limiting the angle of rotation of the regulating plug, and a mountable injector nozzle in the valve outlet conduit, which can be or not provided, in order the valve to be adapted to the type of gas used by the appliance.

The use of a single valve unit for regulating the flow of two different gas families is an advantage of the gas valve invention, when mounted on a cooking appliance. During the start-up of the cooking appliance the user only has to carry out a choice for a control knob from the two possible units accompanying the valve in accordance with the type of fuel gas NG or LP appropriate for the cooking appliance. In this way, there is no need to use tools for adjusting the flow, nor to learn how to adjust the regulating plug as is required in the prior art valve.

The gas valve according to the invention is capable of providing two angular positions of the regulating plug, both spaced apart from each other to supply a different minimum flow Qmin according to the type of gas, NG or standard LPG, used as the fuel for the appliance, being the two different angular positions established by means of a respective rotation stop. At the same time, the user chooses for providing or not the outlet conduit of the valve with an injector nozzle to supply a maximum flow, Qmax, of LP gas or N gas respectively. Neither it is necessary to use tools for carrying out this mounting operation.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of a gas valve according to the invention, fitted on a panel of a cooking appliance.

DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

In reference to FIG. 1, an embodiment of a gas cooking appliance 1 such as a barbecue comprises a control panel 2 on which are mounted one or more rotary gas valves 3 of the type with a frustro-conical regulating plug 6. The cooking appliance 1 may be of two types in respect of the type of gas supplied, natural gas (NG) or liquefied gas (LPG) from the external source -GAS IN- through a valve inlet conduit 4 in the valve body 3 a. Each one of the valves 3 mounted on the panel 2 is always of a single type, all with a same valve body 3 a and regulating plug 6. The inlet flow “Q” is transmitted to an internal chamber 8 in regulating plug 6 in communication with an outlet conduit 5 in the valve body 3 a. The regulating plug 6 rotates around a central axis 10 actuated by shaft 7 for the supply of the flow “Q”, which is directed towards a burner inlet duct 25 on the appliance, being the latter specifically adapted to either N gas or LP gas supplying.

The valve body 3 a has an elongated shape with a frusto-conical central housing cavity 15, wherein the regulating plug 6 is pushed by a spring 11 for a tight sealing. The free end of the actuating shaft 7 is installed passing through a hole 2 a in the appliance panel 2, and afterwards the user fits it with a control knob 9, which is chosen from the two different units of control knob 9, both supplied to the user with each valve unit 3. A cover or valve cap 12 protecting the housing cavity 15, has a tubular bushing 12 b for guiding the actuating shaft 7 in rotation.

The regulating plug 6 may rotate with the shaft 7 an angle “A” in either of the two directions from an initial angular position “zero” degrees corresponding to the valve closed condition “OFF”, to an angular position “A” between 90° and 270°. The OFF position is the initial end of the rotational travel “A”, and it is established for example by a radial pin 13 on the shaft. The cover 12 presents a sliding surface for the radial pin 13, up to a recess 12 a in the cover acting as a stop for the rotation of the radial pin 13.

In reference to the valve embodiment represented in FIG. 1, from the angular position OFF rotating in a clockwise direction, the frusto-conical plug 6 may regulate the supply of different gas flows, a maximum flow “Qmax”, a minimum “Qmin” and an intermediate flow “Qint” between the Qmax and the Qmin, in function of the rotated angle “A”. A constant minimum flow “Qmin” of the N gas must be higher than a “Qmin” of the LP gas, when supplied to a respective burner in both cases of the same power. In function of whether N or LP gas is supplied to the cooking appliance, the control knob 9 to be fitted on the actuating shaft 7 is distinguished for example by means of a lug 14 integral with the control knob. The control knob 9 represented on the appliance in FIG. 1 is adapted for the supply of N gas, having a protuberance or lug 14 projecting from a knob base 9 a facing the panel 2. The second type of control knob 9 having not the protuberance 14, is chosen for its mounting on a cooking appliance that uses LP gas.

The regulating plug 6 rotates to a determined angular position for the supply of a maximum flow “Qmax” of either NG or LPG on both types of cooking appliance 1. The Qmax inflow is regulated by a through hole 16 in the regulating plug, facing the inlet conduit 4. If the regulating plug 6 is rotated further, an intermediate flow “Qint” will be supplied through a groove which has a decreasing area. In accordance with the angle rotated, a through hole 18 or a through hole 19 for a “Qmin” flow is facing the inlet conduit 4 at an ensuing angular position different from one another depending on the gas supplied to the valve, N gas or LP gas respectively. Diameter of each one of holes 18 and 19 are calibrated for the correspondent supply of a Qmin.

When installed on the panel 2, the control knob unit 9 chosen for the supply of LPG, this has no lug 14 or any other element for limiting the angle “A” of rotation. Thus, the regulating plug 6 may rotate as far as an angular position of 270 degrees. The cover 12, provided with the tubular portion 12 b for guiding the valve shaft 7, and said recess 12 a for limiting said longer angular travel corresponding to the LP gas Qmin, is made economically by die-stamping operations only. The economical cost of moulding two types of control knob 9, with and without integral lug 14 for guiding its rotation, is also low.

Besides that described above, other embodiments of the regulating passage openings 18,19 for the different values of Qmin are possible. Half of the control knob 9 units of the kind applied to the NG appliance, may be manufactured with some integrated guiding means 14 on the control knob 9, and interact with some part of the cooking appliance 1 associated with the panel 2, for example a running slot 20 in a panel wall, in order a limit position to be arranged of rotation travel other than that imposed by the actuating shaft.

The arrangement of the two different stop means 12 a and 20, respectively in the valve body 3 a and on the control panel 2, each one with a pre-set circular extension, matches up with the two angular travels “A” corresponding to that of the two hole passages 18 and 19 for supplying a constant NG Qmin or a constant LPG Qmin. In this way, a single valve unit 3 is used, without having to make any adjustment, valid for any type of gas supplied to the cooking appliance 1.

The burner of the cooker appliance (not represented in the drawing), supplied by the valve unit 3, is placed with its feed conduit 25 facing the valve outlet conduit 5. The space of air apart from the burner conduit 25 permits the fuel mixture 26 of primary air with the Qmax flow of outgoing gas from the valve 3 for injection into the burner feed conduit 25.

In accordance with the type of gas, N gas or LP gas, in order to provide the valve 3 with means for adjustment and injection of the Qmax gas flow outgoing from the regulating plug 6, the valve outlet conduit 5 has a press-in or threaded disc 21 inserted for the restriction of the Qmax flow through a calibrated central hole 22, which permits the passage of a given Qmax flow of N gas, substantially higher than the Qmax of LP gas which it is necessary to inject into the burner of the same output. The restrictor disc 21 remains fitted on the valve all the time irrespective of the type of gas used. When the cooker appliance 1 is supplied with LP gas, it is necessary to restrict the outgoing Qmax flow so as to adapt the output of the burner, so the valve outlet conduit 5 is also fitted with an injection nozzle 23, threaded manually into the mouth of the conduit 5, and it has a calibrated hole 24 for a given Qmax flow of LP gas, substantially smaller than the hole in the restrictor disc, the latter secured in a manner valid for the passage of a Qmax both of N gas and of LP gas.

Thus, by means of the interchangeable control knob 9 and the installation or otherwise of the injection nozzle 23, all the cooker appliances, whether they be N gas or LP gas, are fitted with the same valve units 3 without the need to make any flow regulating adjustment. Together with the valve unit 3, the user receives a kit containing two different control knob units 9, easily distinguishable from each other, and an injection nozzle 23. In accordance with the type of gas used, the user chooses one of the controls 9 for manual installation on the actuating shaft 7, and also decides whether or not to install the injection nozzle 23, which is also fitted manually for the injection of LP gas without the need for tools. 

1. Gas cooking appliance adapted for a supply with different types of gaseous fuel, natural gas (NG) or liquefied petroleum gas (LPG), equipped with one or more regulating valves (3) for supplying a respective one or more burners, comprising: at least one regulating valve (3) of the rotary regulating plug (6) type, having a valve body (3 a) provided with a housing for the regulating plug (6), an inlet conduit (4) and an outlet conduit (5), and an actuating shaft (7) projecting from a control panel (2) on the cooking appliance (1), wherein a regulated gas flow “Q” is directed towards the outlet conduit (5) to a cooking appliance burner adapted to one of said types of gas, at least one burner having a feed duct (25) faced to said valve outlet conduit (5) and spaced an air gap apart therefrom, in order the burner to be fed with the fuel mixture formed by the maximum gas flow Qmax outcoming the valve outlet conduit (5), said rotary regulating plug (6) provided with a revolution surface and various peripheral opening (16-19) for the passage of a regulated flow “Q” to a central chamber (8) in communication with said outlet conduit (5), the passage openings being superimposed in alignment with said inlet conduit (4), for supplying three different possible flows to the outlet conduit (5) successively in function of a respective angular position (A) of the regulating plug (6), a constant maximum flow “Qmax”, a constant minimum flow “Qmin”, and an intermediate flow “Qint”, said actuating shaft (7) provided with a means (13) for guiding the angular travel (A) of the regulating plug (6), interacting with a rotation stop means (12 a) in the valve body (12 a), an interchangeable control knob (9) fitted at the free end of the actuating shaft (7), provided with a integral means (14) for guiding the rotation of the shaft (7) and interacting with a rotation stop means (20) in a panel (2) of the appliance, wherein said both rotation stop means (12 a,20) determines an angular position (A) of the regulating plug (6), for the supply of a constant flow Qmin through one respective opening (18,19), means built into said valve (3) outlet conduit (5) for the injection (21,23) of said maximum Qmax flow controlled by the regulating plug (6), distinguishing the N gas supply valve (3) from the LP gas supply valve, so the Qmax injected by the valve is mixed with the primary air and the fuel mixture (26) supplied at the inlet of said burner feed duct (25).
 2. The gas cooking appliance according to claim 1, wherein the regulating plug (6) comprises a series of said various peripheral openings (16-19), aligned in the rotational direction for the supply of said Qmax, Qint and first and second Qmin flows of either of the N or LP gas types, being of these two successive holes (18,19) calibrated for the supply of the respective constant Qmin, and positioned angularly at the end of a respective travel (A), and said guide means (14) on the control knob (9) comprises an integral shoulder or lug (14) on a base (9 a) facing the control panel (2), which presents a circular slide groove (20) establishing the travel extension (A), and one control knob (9) fitted to the actuating shaft (7) is chosen between two different units available, with or without said lug (14) depending in either case on the type of gas, NG or LPG, supplied to the cooking appliance (1).
 3. The cooker appliance according to claim 1, wherein said Qmax flow opening (16) in the valve regulating plug (6) being the same for regulation of both types of gas, N or LP, said means for injecting (21,23) the Qmax maximum flow of N gas or LP gas comprise a restrictor disc (21) fixed into the valve outlet conduit (5), with a centre hole (22) calibrated for the injection of a Qmax of N gas, and in the valve (3) unit for being supplied with LP gas, they further comprise an injection nozzle (23) provided with a central hole (24) of smaller calibre than the hole (22) in said restrictor disc (21), the nozzle being mounted by hand at the end of the valve outlet conduit (5), only for the regulating a Qmax flow of LP gas. 